JPS582998A - Alarm - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a receiver sequentially calls a plurality of repeaters.
Receiving and displaying monitoring information of terminal devices such as fire detectors, antitheft equipment, disaster prevention equipment, and air conditioners connected to the repeater from the called middle equipment or called middle equipment. This invention relates to an alarm device that transmits control information of a terminal device.

This type of alarm device includes fire detection hot water transmitters and other anomaly detectors that are used for each fire warning area or for multiple fires*a to a small number of common signals extending from a receiver equipped with a microprocessor, etc.; Receives and displays monitoring information indicating the status of terminal equipment such as fire prevention/exhaust equipment, fire extinguishing equipment, hollow leg equipment, etc., or receives and displays control information for terminal equipment according to the results of large-scale monitoring information. The repeater is known to send and control signals.

However, with an alarm system like ζO, if there are a large number of repeaters, it takes time to send the control information (while receiving visual information) and it is difficult to detect an abnormality such as a fire.
A good terminal device to deal with this problem 1) This invention also solves the problem of 1) inconsistent control and 1) failure of the receiver, making it impossible to monitor abnormal situations such as fire or control the terminal equipment at all. Considering point K above, even if there are a large number of repeaters, there is little time to send and receive monitoring information and control information to all repeaters, and even if a failed receiver fails, an abnormality may occur due to the mechanical sound of the terminal being viewed by IITO. The purpose is to provide an alarm device that can be controlled.

An embodiment of the present invention will be described below with reference to the drawings.

No. 111I is a system diagram of one embodiment of the present invention, REl is the first receiver, wing is the second receiver, and C is the #11 receiver 11.
11 to Ill common signal line J whose four ends are connected to the second receiver R1.

extends from 82 receiver R1, and its terminal end is connected to the first receiver ix.
t K*tll hjH1lk14tW1, T1~T
I& is a repeater installed in each fire warning area and connected in parallel to the first and second common signals #Jt. , ~TSK is connected to a terminal II (not shown) such as an abnormality detector such as a fire detection hot water transmitter, a disaster prevention equipment such as a fire prevention equipment, a fire prevention equipment, a fire extinguishing equipment, etc., and a hollow leg equipment.

FIG. 2 shows the first and second receivers RE, and RE.

1 is a block diagram of an embodiment of 1, in which 1 is a microprocessor;
A control unit composed of ROM, RAM, etc., 2 is a first storage unit composed of ROM etc., which stores a normal processing program for controlling the control unit 1 when the other receiver is normal; 21e storage unit stores an abnormality processing program for controlling the control unit 1 when an abnormality occurs in the other receiver, and 4 converts the parallel code signal output from the control unit 1 into a serial code. After that, the FM signal is modulated to the first receiver REI and then to the first common signal line JR and then to the second receiver RE.

In this case, the second common signal bundle JsK is output, and the FM signals input from these signal lines are demodulated into a serial code, converted into a dwarf code, and outputted by a serial/parallel converter circuit and a modulator/demodulator. Input/output section configured, S is jllE
A signal detection section detects the FM signal from the second common signal line Jl in the case of 1ll-like RE, and from the first common signal line J1 in the case of the second reception side RKI; 7 is the abnormality determination unit 6, which is composed of a stable multi-device plater, etc., which sometimes outputs an abnormal signal even though it no longer detects the FM signal.
The first storage unit 2 is connected to the control unit IK while no abnormal signal is input from the controller, and the second storage unit 3 is connected to the control unit IK while an abnormal signal is input.
8 is a switching unit that connects the control unit IKm to a display unit that displays the area where the fire occurred and the status of the terminal equipment, and a repeater 'ra t'rs I... for controlling the terminal equipment. Monitoring information t4 indicating terminal device status Sat! A second receiver R1 stores a log for controlling and controlling a terminal device according to the results of requested and received monitoring information.
The first storage unit 2 of m has an even numbered repeater Ts e T4.
m... A program is stored for controlling the terminal equipment according to the results of the call (calling the next caller and requesting the monitoring information of the terminal equipment), and the first and second receivers RII and B] All Fi repeaters T1 ~ in the second storage section 3 of C
The diagram shows 111 examples of repeaters 7, 71, and 71, in which programs are stored that sequentially call up the terminals to request monitoring information of the terminal equipment, and control the terminal equipment according to the results. In the plotter diagram, 11 is a control section having the same configuration as the winning section 1 of the receiver RICI, R1, and 12 is a control section for the first and second receivers R.
It decodes the command signals from K, and l1l=, transmits the requested monitoring information of the terminal equipment to the receiver, controls the terminal equipment, and controls the terminal equipment.The control l111 program for i3 is stored. A storage unit consisting of 10M etc., 1
4 is an input/output unit having the same configuration as the input/output s4 of the receiver R1t e 11m, 15 is the own receiver ILIs or the jllt7t- belonging to the 1°K is the third common signal line Js tf
t is the signal detection unit function that detects the FM signal flowing in JsK, and this signal detection 1115t% number repeater 1, τ
Plow, - Kjll common 1 common AI as shown by the EK line
I1mJt to the input/output section 14 This is a terminal input/output section where signal lines and control from terminal devices such as various disaster prevention equipment and air conditioning equipment are handled.

Next, to explain the K11k work, normally each control section 1 of the irises 1 and the second receiver RK, , R1C9 is connected to the first storage section 2.
The first receiver RIB is connected to the odd-numbered repeater Tl through the first signal line JS.

The..., and the second receiver [h is the second common (14
＃纏J、Through the even number repeater 71m ``4...
・tll [* to call the terminal equipment, e.g. fire detector internal transmitter OIl to determine whether or not a fire has occurred.
T 1 +
T**... decodes the received and next command signal, and if the command is a request command, the requested monitoring information of the friend terminal, such as whether a fire detector or transmitter is outputting a fire signal. or the first receiver RI through the first common signal line 11.
tK is transmitted, and if it is a control command, the specified terminal equipment, such as an emergency bell or a fire door, is controlled through the terminal input/output unit 18. Similarly, from the second receiver 1g, even numbered numbers 111@T * * T 41 are called sequentially.
”・It decodes the received command signal and operates according to the contents of the command.

In this way, when the first and second receivers R1C1 and RKl are functioning normally, the FM signal output from the first receiver RE is periodically transmitted to the first common signal 1IIJ1 at 61
At the same time, the FM signal output from the odd numbered middle wAfunTleTl ・- flows, and the FM signal output from the odd numbered
In addition, the FM signal output from the j112 receiver @ax, is periodically outputted from Km, and the even numbered middle -@Ts, 〒4.
The FMJ signal output from ... flows to this #11 common signal J1, the signal detection unit 5 of the second receiver ILK and the odd number repeater ``l * 'ex t
The signal detection units 15 of ... detect the FM signal flowing through the t+gz common signal line JmK, and the signal detection unit 116 of the first receiver RKl and the even-numbered repeater 〒m*? 4e... are detected by the signal detection s15 of the first and second receivers Ryell R, the third abnormality determination unit 6, and the middle g unit T.
-1 to TlCl The abnormality determination unit 16 does not output an abnormality signal.

By the way, when the first receiver RE fails and stops transmitting the FM signal, the odd numbered repeater T.

, error... Since no call is received from the first receiver wing E1, the FM signal is no longer transmitted, and the first common signal line JI
For K, 7M5 no longer flows at all.

15 no longer detects the FM signal from the first common signal line J. Therefore, the phone number detectors s5 and 15 each output an abnormal signal when a predetermined time has elapsed since the last FM signal was detected. The repeater with the path number 〒l + T, l'' is activated by the abnormality signal output from the abnormality determining section 16'', and the input/output section 14, which had been connected to the first common signal line JIK, is operated. The second common signal #JsK is switched and connected. second
In the receiver REm, the switching s7 is activated by the abnormality signal output from the abnormality determination unit 6, and the second storage unit 3t-control @IK*1iR
Although the connection of the first storage section 2 is stopped, the control section 1 of the second reception IIRE is made with the second operating memory *5 toa constantly processing product Kli.
P" common signal line 1 through eclipse I/1a11'"...
It transmits a command signal to call T% in sequence and request terminal equipment 0*m information, and transmits a command signal to control the terminal S according to the result of the received monitoring information.

The repeater TI-'r%, which is sequentially called from the 20th receiver REs through the 8th common signal line Jl, decodes the received command signal and, if the command is a request command, monitors the requested terminal equipment. transmitting information through a second common code Ill J s to a second receiver RE, designated as control commands 0 and a first receiver RΣ1 to control nine terminal devices;
The fault has been fixed, and the 1st cost transmitter [relays odd numbers from 1!] 1
When an FM signal is output to the $111 communication line J1 to sequentially call Tt I TI+..., the abnormality determination li6 stops outputting the signal O due to the fact that this FM signal was input by the second person. , by stopping this abnormal signal O output, p switching l
17 connects the first storage unit 2 to the control unit 1 one day later. As a result, the control unit 1 of the g2 receiver RICm operates according to the normal processing program stored in the first memory l12.
Even numbered repeaters TI+D4. ... resumes sequential recall of the books. Also among the odd numbers 11t/#T1. Ts
, ``・ means that the signal detection section 15 detects the FM signal, and the abnormality determination section 16 stops outputting the abnormal signal, and by stopping the output of this abnormal signal, the switching section 17 is restored and the input/output section 14 is switched to the first position. As a result, the odd-numbered repeaters 'r11 Tl*... stop receiving the FM signal output from the second receiver wing 2=, and the first receiver REl Resumes reception of FM signals output from.

By the way, in the above, the first receiver RE is connected to the second receiver RF through the j111 common signal line J3K.

is the second common signal line, which connects multiple relays 41Tt through ljl.
Although we have described an embodiment in which T1 is sequentially called, the first and second receivers REI and REI sequentially call a plurality of repeaters T and %T% through one common signal line. This embodiment will be explained with reference to FIGS. 4 to 6.

FIG. 4 is a system diagram showing the first receiver RE1. ! : A second receiver RE is connected to both ends of the common signal line 1, and a plurality of repeaters T1 to 7m are connected in parallel to the common signal line JK.

FIG. 5 is a block diagram of the first and second receivers REI and one embodiment of the REI, in which the control unit 1. First storage unit 2. Second storage unit 3. Abnormality determination 11s6. The switching section 7 and the display operation section 8 have the same configuration as that shown in FIG. 24 is a serial/parallel converter circuit and a variable 1lII! The input/output section consists of
The input/output section 24 of the receiver REI outputs the FM signal of frequency f1 between the common signal line 1, and the input/output section 24 of the second basic radio receiver RICm outputs the FM signal of frequency f.
configured. Further, 2-5 is a signal detection section, and the first receiver R
The signal detection unit 25 of E, converts the frequency fsOFM signal into a second
The signal detecting section 25 of the receiver RE' is configured to detect an FM signal of frequency f.

FIG. 6 is a block diagram of one embodiment of the relay IIs T t~71%, in which the control unit 11. Storage unit 12. Abnormality determination unit 16.
The switching circuit 17 and the terminal input/output section 18 have the same configuration as that shown in FIG. 34 and 44 are the first and second input/output sections each consisting of a serial-to-parallel converter circuit and a converter V4, and the first output section 3-4' is connected to the common signal line 1 for frequency control. The f10FM10t and 17t-second person output sections 44 are configured to respectively input and output the FM signal of frequency f1. and odd numbered repeaters Tl e Tl +.
..., the abnormality determination unit 1-6 detects the first
The FM signal of the human output section 34Kfs is also transmitted from the even-numbered repeater 1 to 4. ..., the abnormality determination unit 16 determines whether or not the FM signal of fl is input to the second person output unit 44 within a predetermined time interval, as shown by the EK dotted line, and determines whether the KF rat injury signal is input within the predetermined time. When it stops working, the switching 1117 is controlled and the input ti3 output section connected to the control section 11 is changed to the odd numbered repeater Tt I Tl e..., the first person's output s.
34 to the second person output 1644KS, and in the even numbered repeater T proverb +'T4+..., the second person output section 44 is switched to the [one person output section 34].

In the alarm/alarm device configured in this manner, when the first and second receivers RIC and RIM are functioning normally at 4 and 4, the first receiver RE is set at the 11th among the odd numbers. Ts, r
ls-... through the common signal line J to the FM of frequency f1.
The called odd-numbered repeater transmits the requested monitoring information to the first receiver ggt at the frequency ft.
The M signal is transmitted to control terminal equipment. The second receiver R11 sequentially calls the even numbered repeaters T-t T4゜... with an FM signal of frequency ts, and transmits the control command ◆ during the request command, and each call 1';! Relay I of the even number issued! Xl! The second receiver transmits the requested monitoring information using an FM signal of frequency f3 to control the friend terminal equipment. Therefore, since FM signals of frequencies f1 and ts flow through the common signal line JK at intervals shorter than the predetermined time, the first and second receivers izt and R
1. Normal discrimination @* and medium-sized abnormality discrimination part 1
No. 6 outputs any abnormal signal.

By the way, when the first receiver Rffil breaks down and stops outputting the FM signal of frequency f1, the odd numbered receiver Rffil
Since le'- also no longer outputs the frequency f10FM signal, the frequency f10F M@4J no longer falls on the common signal line 1. As a result, among the odd numbers III IIT t
The abnormality determination unit 16 of *Ts*... outputs an abnormal signal to the switching unit 17 when a predetermined time has elapsed since the last FM signal was input to the first input/output unit 34, and the switching unit 17 outputs an abnormality signal to the switching unit 17.
The human output section 44' is connected to the control section 11KI[0].As a result, the control $IIK of all relays 11'rt~T% becomes connected to the second human output section 44. Also, the second receiver RE
, the abnormality determination unit 6 also sends the frequency f10FM to the signal detection unit 25.
After a predetermined period of time has elapsed since the last input of the signal, KJ% common belief is output, and this abnormal signal causes the p switching I17 to connect the second memory li3 to the control 111.This causes the p second receiver 1 to o
The control unit 1 is operated by the abnormality processing program in the 1s2 memory I13, and all repeaters 〒1~7m are connected to the frequency f, OFM.
The call receiver sequentially calls and sends request commands and control commands, and the call receiver receives the monitoring information of the nine terminal devices requested by the second receiver RICs with an FM signal of frequency f3.
K Send Friend 9 Controls the terminal device.

Then, a failure of the first receiver ILIt immediately occurs again at the frequency f.
1 FM signal is input to the common signal line JK ratio output, and this FM signal is input to the signal detection section 25 of the j12 receiver R1 and the first input/output section 36 of the odd numbered repeater Tl * Ts f... Abnormality determination unit @(1- stops outputting abnormality signal. This Kyop second receiver blade IC= is connected to control unit IK first storage unit 2, odd numbered 11
16) At T1*Ts..., the first person output unit 34 is connected to the control l111 and the normal state is restored.By the way, in the above embodiment, the JIll and the second receiver are connected to the common signal line, respectively. Although a multiplexing method in which signals of different frequencies are outputted will be described, a time division method can also be used in which the first and second receivers output signals of the same frequency as the common signal i1.

Next, one embodiment of a receiver and a repeater in the case of using this time division method will be explained with reference to FIGS. ! The control section I
A demodulator 251 that outputs a K detection signal, and this demodulator 25
In order to prevent 1 from detecting the FM signal sent by the input/output unit 24 of its own station, the input/output unit 24 is sending out FM signals.The input game prohibits the input of FM signals by controlling the amount control $1. ) 2B2. In addition, the abnormality determination unit 6 includes a first register 61 that stores an attribution record, which is a repeater calling signal, among the signals sent by the input/output unit 24, and a demodulator 251 that demodulates and stores an address code portion of the nine series hoods. When the address code of the second register 62 and the address code of the second register 61 match with the address code of the second register 61, the coincidence circuit 63 outputs a match signal, and the NO? IIK in which the circuit 64, the output of the ζ0NOT circuit 64, and the iris 2 register 62 store the address code.
The first circuit is composed of an AND circuit 65 controlled by the memory signal to be output and K, and a retrigger lid monostable multi-pipe frame that is reset by the output of the ND circuit 65.
The first tie, which is set by the memory signal outputted by the timer 66 and the strip register 61 to the address code which is stored in the address code, and is reset by the coincidence signal of the 1k circuit 63, and the eighth tie, which lasts for a short time, It is composed of f67. and control section 1. 1st and 20th memory s2 and 31 people appearance section 24. The switching unit 7 and display control s8 have the same structure as the receiver shown in FIG. #I5.

In the receiver configured in this way, while the demodulator 251 detects the FM signal sent by either the other receiver or the repeater from the common signal IIJ and outputs the detection signal, the control unit 1 is The parallel code consisting of the address code and instruction code created according to the normal processing program in the first storage section 2 is not output to the input/output section 24, and therefore the human output section 24 does not output an FM signal. When the demodulator 251 no longer detects an FM signal on the common signal line 1 and no longer outputs a detection signal, the control section 1 is parallel-converted and further modulated into an FM signal by the modulator/demodulator 242, which is sent out on the common signal line JK.

At this time, the address code among the parallel codes output from the control s1 is stored in the j11 register 61, and this register 61 outputs the storage signal tube to set the second timer 67. Further, while the input/output unit 24 is transmitting the FM signal, the input gate 2S2 is turned off under the control of the control unit 1, and the demodulator 251 is prohibited from detecting the FM signal transmitted by the own station. When the input/output section 24 finishes transmitting the FM signal, the input signal line 252 is turned on under the control of the control section 1, and the demodulator 251 monitors the state of the common signal line 1. When the demodulator 251 detects an FM signal from the common signal 11J, it outputs the detection signal to the control s1 and detects the signal 7'.
jFM signal is demodulated into a serial code, the address code of this serial code is stored in the second register 62, and the second
The register 62 outputs a signal (hereinafter referred to as a storage signal) indicating that the address code has been stored to the ND circuit 65 and the coincidence circuit 63.

From this K, the matching circuit 63 determines whether the address of the first register 61 and the address of the second register 62 match. When the addresses of the register 61 and the jllE2 register 62 match, the - circuit 63 generates a match output, and this - scattered output causes the p-th tie! KM when 67 is reset
The OT circuit 64 outputs O and the AND circuit 65 is prohibited from operating. However, the jlIl register 61 and the second
If the addresses of the registers 62 do not match, the match circuit 63 does not produce an output, and the ND circuit 65 operates with the memory signal of the second register 62 and the 1 output of the NoT circuit 64 to produce an output.・Reset. Due to this reset, the first timer 66 does not output an abnormal signal to the switching unit 7.
The switching unit 7 continues to connect the first memory s2 to the control unit IK. and the second register 62Km [the address code to be input next does not match the address of the register 61;
When the predetermined time of the timer 67 has elapsed, the ll52 timer 67
is turned off and an off signal is output from the control section IK ratio. The control i11 then calls the next repeater.

★One of the receivers in 9i failed and the second register 62KI [
Next, the address code to be input is only the address of the return signal from the intermediate device called by the own station, but the address from the other receiver or the intermediate ims that should be called from the other receiver is not input, and the If the addresses of the two registers 62 continue to match and the first tie-v6@ is not reset for a predetermined period of time, the first timer 66 is turned off and outputs an abnormality signal. This abnormality signal causes the switching section 7 to operate and the second memory s3 to be controlled by the control section IK! Subsequently, the control Ill operates according to the abnormality processing program stored in the second storage section 3 and sequentially calls all the repeaters.

FIG. 8 is a block diagram of a repeater, except that an input/output section 54 and a signal detection section 35 having the same configuration as the input/output section 24 and signal detection section 25 of the receiver shown in FIG. 117 are provided. It has the same configuration as the repeater shown in the figure.

In the repeater configured as described above, the signal detection section 35 monitors the state of the common signal line 1 and outputs a detection signal to the control section 11 when an FM signal is detected from the common signal line 1. If there is a parallel code to be sent to the receiver through the common signal line 1, the control unit 11 outputs this parallel code to the input/output unit 54 when no detection signal is input from the signal detection unit 35,
The input/output unit 54 converts the parallel code into a serial code and then converts the parallel code into a serial code.
It is modulated into an M signal and output to the common signal line JK. At the same time, the control section 11 controls the open signal detection section 35 from which the input/output section 54 outputs the FM signal, and allows the signal detection section 35 to detect the FM signal output from the input/output section 54 .

Note that when the receiver shown in FIG. 7 and the repeater shown in FIG. 8 are used in the alarm device shown in the system diagram shown in FIG. (first receiver) or the second common signal line Js (second receiver), and the second common signal line Jm' (first receiver) to the input gate 252 of the signal detection section 25. Communication line J.

(second receiver), and both signal lines of the first common signal line J1 and the second common communication line 1. are connected to the signal detection section 35 and input/output section 54 of the repeater, respectively.

In addition, in each of the above embodiments, the first and second receivers RE, RK are provided at both ends of the common signal lines Jl and Js "*" as shown in FIGS. 1 and 4, and at the same location. and each receiver REI and RE
, by displaying the number of the repeater that does not respond to a call, it is possible to determine the location of a break in the common signal line from this display.

According to this invention, the first and second receivers normally monitor and control all the repeaters, and if the function of one receiver stops, the other receiver monitors and controls all the repeaters. Therefore, even if there are a large number of repeaters to be monitored and controlled, it takes less time to send and receive monitoring information and control information to all repeaters, and it is possible to quickly respond to abnormalities such as fires. Even if the monitoring and control function of one receiver stops due to malfunction or maintenance inspection, abnormal situations can be monitored and terminal equipment can be controlled through all repeaters.
- An alarm system that can be used reliably is obtained.

[Brief explanation of drawings]

Figures 1 and 4 are system diagrams of different embodiments of the alarm Ikill according to the present invention, Figures 2a and 7 are block diagrams of different embodiments of the receiver, Figures 3 and 6. and FIG. 8 are block diagrams of different*m examples of repeaters. R1,...first receiver, RE3...-second receiver, 11-7%...repeater, 1! ...First common signal line, J3...Second common signal line, 1...Common signal line, 1.11...Control unit, 2...First storage unit, 3...
・Second storage unit, 4, 14, 24.54... input/output unit,
5, Is, 25.35...signal detection section, 6.16...
- Abnormality determination section, 7.17... Switching section, 8... Display operation section, 12... Storage section, 18... Terminal input/output section, 3
4... First person output section, 44... Second person output section. Patent application Jinnomi Disaster Prevention Industry Co., Ltd.

Claims (1)

[Claims] 1. A first receiver, a second receiver, and the first and second receivers.
An abnormality detector connected in parallel to the 0 receiver and sequentially called by the 1st and 2nd receivers, and a plurality of MUs to which terminal equipment such as horizontal control equipment is connected,
- The first and second receivers are equipped with a command signal slave terminal device that sequentially calls each of the friend repeaters determined among the plurality of intermediate devices and requests monitoring information of the terminal device from the repeater. Controlling command 4I! When transmitting ◆, the first monitoring control means receives and decodes the monitoring information from the repeater, and the other receiver determines whether there is a signal being transmitted or not and detects an abnormality in the other receiver. To detect “＾Detect!P
', the abnormality detecting means detects an abnormality in the other receiver, and the second monitoring and controlling means which is switched from the first monitoring and controlling means of the friend 111K and the first monitoring and controlling means of its own. One part or all functions and the first part of the other receiver
One part of the supervisory control means tfe and a second supervisory control means having the functions of all the parts transmit a command signal transmitted from the first or second receiver to each of the repeaters. The 1t9th transmits the received, decoded and requested monitoring information of the terminal equipment to the second receiver, and also provides a 4+1 alarm when monitoring and control means for controlling the terminal equipment are respectively provided. Device. 2. The relay ISO monitoring control means includes a terminal input/output section to which various terminals/devices can be connected, a control section, and a rounding section that determines whether the control section receives a call from the receiver or not. A memory section stores instructions and commands for controlling the nine terminals that deciphered the command signal from the receiver and sent monitoring information for the terminal equipment, one of the receivers, and one of the receivers. An anomaly detection unit that is called by one of the receivers and determines whether a signal is transmitted from the receiver within a predetermined time interval to determine whether there are two animals or not; An input/output switching section connects the control section to one receiver and makes a signal sound while detection is being made within the time interval, and connects the control section to the other receiver when no detection is made within the predetermined time interval. 3. The monitoring control section of the repeater includes a terminal input/output section to which various terminal devices are connected, a control section, and this control section serves as a receiver. Rounding instructions and receiver f to determine whether or not a call has been received from
a storage unit storing commands for decoding the command signals from the terminal equipment and transmitting monitoring information of the terminal equipment and for controlling and transmitting the terminal equipment; The input/output section connects to the machine and other repeaters, and the second receiver detects the signals transmitted from the receiver and the other repeaters. The alarm device according to claim S, further comprising a signal detection section that prohibits the control section from transmitting monitoring information. 4. Claims 1 to 3, wherein the first receiver and the second receiver are connected to a common signal line, and a plurality of repeaters are connected in parallel to the common signal line. The alarm device described in any of the above. 5. The first receiver receives the 10th common signal IIAKW! The receiver of the serial tX2 is connected to the common signal line #I2, and a plurality of repeaters are connected in parallel to the first and second common signal lines, respectively, and the abnormality detection means of the first receiver is connected to the common signal line #I2. is the second above
The abnormality detection means of the second receiver detects the signal of the other receiver from the common signal line of the first common signal. alarm device.